/*
 * Copyright 2004 original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jbfilter.jsp.converters;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.jbfilter.impl._JbFilterDateUtils;

public class DateConverter extends AbstractConverter<Date> {

	private String pattern;
	private SimpleDateFormat simpleDateFormat;

	public DateConverter() {
		this(_JbFilterDateUtils.DEFAULT_PATTERN);
	}
	
	public DateConverter(String pattern) {
		setPattern(pattern);
	}
	
	public void setSimpleDateFormat(SimpleDateFormat simpleDateFormat) {
		if (simpleDateFormat == null) {
			throw new NullPointerException("simpleDateFormat can't be null.");
		}
		this.simpleDateFormat = simpleDateFormat;
		pattern = simpleDateFormat.toPattern();
	}
	
	public void setPattern(String pattern) {
		if (pattern == null) {
			throw new NullPointerException("pattern can't be null.");
		}
		if (pattern.equals(this.pattern)) { // already set like that
			return;
		}
		simpleDateFormat = _JbFilterDateUtils.getSimpleDateFormat(pattern);
		this.pattern = pattern;
	}

	@Override
	public Class<Date> getRegisteredClass() {
		return Date.class;
	}

	@Override
	protected Date fromStringAbstractConverter(String dateString) {
		try {
			return simpleDateFormat.parse(dateString);
		} catch (ParseException e) {
			throw new ConverterException(e);
		}
	}
	@Override
	protected String toStringAbstractConverter(Date date) {
		return _JbFilterDateUtils.dateToStringNullSafe(date, simpleDateFormat);
	}

}
